<template>
  <div class="login-container">
    <canvas id="background" />
    <el-form
      ref="loginForm"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
      auto-complete="on"
      label-position="left"
    >
      <div class="title-container">
        <h3 class="title">后台登录</h3>
      </div>

      <el-form-item prop="username">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="username"
          v-model="loginForm.username"
          placeholder="用户名"
          name="username"
          type="text"
          tabindex="1"
          auto-complete="off"
        />
      </el-form-item>

      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon icon-class="password" />
        </span>
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.password"
          :type="passwordType"
          placeholder="密码"
          name="password"
          tabindex="2"
          auto-complete="off"
          @keyup.enter.native="handleLogin"
        />
        <span class="show-pwd" @click="showPwd">
          <svg-icon
            :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'"
          />
        </span>
      </el-form-item>

      <el-form-item prop="code" class="code-form-item">
        <span class="svg-container">
          <svg-icon icon-class="validCode" />
        </span>
        <el-input
          v-model="loginForm.code"
          placeholder="验证码"
          auto-complete="off"
          @keyup.enter.native="handleLogin"
        />
        <el-image
          title="看不清？点击换一张"
          :src="codeImgSrc"
          class="verification-code"
          @click="fetchCode"
        />
      </el-form-item>

      <el-button
        :loading="loading"
        type="primary"
        style="width: 100%; margin-bottom: 30px"
        @click.native.prevent="handleLogin"
        >登录</el-button
      >
    </el-form>
  </div>
</template>

<script>
import { getVerificationCode } from "@/api/system";
import Particles from "particlesjs";
import JSEncrypt from "jsencrypt";

export default {
  name: "Login",
  data() {
    return {
      loginForm: {
        username: "",
        password: "",
        code: "",
        uuid: "",
        client: 0,
      },
      loginRules: {
        username: [
          { required: true, trigger: "blur", message: "用户名不能为空" },
        ],
        password: [
          { required: true, trigger: "blur", message: "密码不能为空" },
        ],
        code: [
          { required: true, trigger: "change", message: "验证码不能为空" },
        ],
      },
      loading: false,
      passwordType: "password",
      redirect: undefined,
      codeImgSrc: "",
      publicKey: "",
    };
  },
  watch: {
    $route: {
      handler: function (route) {
        this.redirect = route.query && route.query.redirect;
      },
      immediate: true,
    },
  },
  created() {
    this.fetchCode();
  },
  mounted() {
    // 当 DOM 渲染之后，初始化背景插件
    Particles.init({
      selector: "#background",
      speed: 0.6,
      color: "#ffffff",
      connectParticles: true,
      maxParticles: 100,
    });
  },
  methods: {
    fetchCode() {
      // 获取验证码
      getVerificationCode().then((res) => {
        this.codeImgSrc =
          "data:image/jpg;base64," +
          btoa(
            new Uint8Array(res.data).reduce(
              (data, byte) => data + String.fromCharCode(byte),
              ""
            )
          );
        this.loginForm.uuid = res.headers["uuid"];
        this.publicKey = res.headers["sign"];
      });
    },
    showPwd() {
      if (this.passwordType === "password") {
        this.passwordType = "";
      } else {
        this.passwordType = "password";
      }
      this.$nextTick(() => {
        this.$refs.password.focus();
      });
    },
    encryptPassword(pass) {
      let jse = new JSEncrypt();
      jse.setPublicKey(this.publicKey);
      return jse.encrypt(pass);
    },
    handleLogin(e) {
      let keyCode = window.event ? e.keyCode : e.which;
      if (keyCode && keyCode !== 13) {
        return;
      }
      this.$refs.loginForm.validate((valid) => {
        if (valid) {
          this.loading = true;
          let loginFormCopy = Object.assign({}, this.loginForm);
          loginFormCopy.password = this.encryptPassword(
            this.loginForm.password
          );
          this.$store
            .dispatch("user/login", loginFormCopy)
            .then(() => {
              this.$router.push({ path: this.redirect || "/" });
              this.loading = false;
            })
            .catch(() => {
              this.loading = false;
            });
        } else {
          console.log("登录提交发生错误");
          return false;
        }
      });
    },
  },
};
</script>

<style lang="scss">
/* 修复input 背景不协调 和光标变色 */
/* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

$bg: #283443;
$light_gray: #fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
  .login-container .el-input input {
    color: $cursor;
  }
}

/* reset element-ui css */
.login-container {
  .el-input {
    display: inline-block;
    height: 47px;
    width: 85%;

    input {
      background: transparent;
      border: 0px;
      -webkit-appearance: none;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $light_gray;
      height: 47px;
      caret-color: $cursor;

      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: #454545;
  }
}
</style>

<style lang="scss" scoped>
$bg: #2d3a4b;
$dark_gray: #889aa4;
$light_gray: #eee;

.login-container {
  #background {
    position: absolute;
    display: block;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
  }

  &::after {
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background: inherit;
    filter: blur(4px);
    z-index: 2;
  }
  min-height: 100%;
  width: 100%;
  // background-color: $bg;
  background: url("../../assets/bg_images/bg-login.jpg") no-repeat fixed center;
  background-size: cover;
  filter: 2px;
  overflow: hidden;

  .login-form {
    background: inherit;
    box-shadow: rgba(0, 0, 0, 0.2) 0 0 10px;
    border-radius: 10px;
    z-index: 4;
    position: relative;
    width: 520px;
    max-width: 100%;
    padding: 40px 35px;
    margin: 0 auto;
    margin-top: 160px;
    overflow: hidden;
    .el-form-item {
      border: none;
      background-color: transparent;
      border-radius: 0;
      border-bottom: #4f555e 1px solid;
    }
    .code-form-item {
      .el-input {
        width: 60%;
      }
      .verification-code {
        width: 150px;
        height: 40px;
        margin: 0;
      }
      .el-image {
        cursor: pointer;
      }
    }
    .el-button {
      background-color: transparent;
    }
    .el-button:hover {
      background-color: #409eff;
    }
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }
}
</style>
